[LIST] HTC secret codes for HTC One X

General codes

HTC specific codes

*#*#4636#*#* = device information program (such as telephone, battery, wifi, ...) << all these generic system information tools in the market read the same data as this code/tool does - [working]
*#*#7262626#*#* = Field-Test
*#*#3424#*#* = HTC Function Test program (very useful!) - [working]
*#*#1111#*#* = Show software version
*#*#2222#*#* = Show hardware version
*#*#232338#*#* = Show WiFi mac address
*#*#232337#*# = Show Bluetooth mac address
*#*#1472365#*#* = GPS test
*#*#1575#*#* = GPS test #2
*#*#232331#*#* = Bluetooth test
*#*#0*#*#* = display test (?)
*#*#2663#*#* = touch screen version (?)
*#*#2664#*#* = touch screen test(?)
*#*#759#*#* = Rlz Debug UI (?)

HARMFUL CODES
BE CAREFUL WITH THEM!

*#*#7780#*#* = factory reset !! BE CAREFUL! - Seems it doesn't work - Thanks to diamant-x for his test
##4772579# = reset GPS - working?
*2767*3855# = factory format !! BE CAREFUL!
*#*#197328640#*#* = service mode? - after two tests seems to be NOT WORKING

UNKNOWN CODES
BE CAREFUL WITH THEM!

*#*#36666#*#* = starts FlexNet Mode | Don't know what it is ... | Discussion about flex net mode: http://forums.androidcentral.com/htc...lled-apps.html | So FlexNet may be a substitute for CarrierIQ ..
*#*#7669633#*#* = FlexNet related
*#*#361066#*#* = FlexNet related
*#*#361166#*#* = FlexNet related
*#*#362066#*#* = FlexNet related
*#*#366633#*#* = FlexNet related
*#*#368866#*#* = FlexNet related
*#*#3688633#*#* = FlexNet related